One of my favorite apps. Great for multiple screens.

At work I have an external screen that I have arranged to be tall so I can review long documents easily. BetterSnapTool is terrific for letting me quickly arrange my documents. Command-Option-T and the current document is the top half of the screen and the width is full width. This helps me especially because I often have lots of windows open. Often the right sides are off the screen and this app fixes that in one motion not drag, resize, drag, resize, etc.
I would recommend this to anyone who has multiple screens or has a big screen with several windows open at once.

KenSchleede about BetterSnapTool